001/* 002 * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved. 003 * 004 * Project and contact information: http://www.cascading.org/ 005 * 006 * This file is part of the Cascading project. 007 * 008 * Licensed under the Apache License, Version 2.0 (the "License"); 009 * you may not use this file except in compliance with the License. 010 * You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, software 015 * distributed under the License is distributed on an "AS IS" BASIS, 016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 017 * See the License for the specific language governing permissions and 018 * limitations under the License. 019 */ 020 021package cascading.flow.hadoop.stream.element; 022 023import cascading.flow.FlowProcess; 024import cascading.flow.hadoop.HadoopCoGroupClosure; 025import cascading.flow.hadoop.HadoopFlowProcess; 026import cascading.flow.hadoop.stream.HadoopGroupGate; 027import cascading.flow.stream.duct.Duct; 028import cascading.flow.stream.graph.IORole; 029import cascading.flow.stream.graph.StreamGraph; 030import cascading.pipe.CoGroup; 031import cascading.tuple.Tuple; 032import cascading.tuple.io.IndexTuple; 033import org.apache.hadoop.mapred.OutputCollector; 034 035/** 036 * 037 */ 038public class HadoopCoGroupGate extends HadoopGroupGate 039 { 040 public HadoopCoGroupGate( FlowProcess flowProcess, CoGroup coGroup, IORole role ) 041 { 042 super( flowProcess, coGroup, role ); 043 } 044 045 @Override 046 public void bind( StreamGraph streamGraph ) 047 { 048 super.bind( streamGraph ); 049 } 050 051 @Override 052 protected HadoopCoGroupClosure createClosure() 053 { 054 return new HadoopCoGroupClosure( flowProcess, splice.getNumSelfJoins(), keyFields, valuesFields ); 055 } 056 057 @Override 058 protected void wrapGroupingAndCollect( Duct previous, Tuple valuesTuple, Tuple groupKey ) throws java.io.IOException 059 { 060 Integer ordinal = ordinalMap.get( previous ); 061 062 collector.collect( new IndexTuple( ordinal, groupKey ), new IndexTuple( ordinal, valuesTuple ) ); 063 } 064 065 @Override 066 protected Tuple unwrapGrouping( Tuple key ) 067 { 068 return ( (IndexTuple) key ).getTuple(); 069 } 070 071 protected OutputCollector createOutputCollector() 072 { 073 return ( (HadoopFlowProcess) flowProcess ).getOutputCollector(); 074 } 075 }